Which are the three Basic Texts of Vedanta School of Thought?

The three basic text of the Vedanta school of thought is
referred to as Prasthana – Traya. They are

Upanishads

Bhagavad Gita and

Brahmasutra

Brahmasutra of Badarayana is a treatise on the nature of
Ultimate Reality and Truth (Brahman) as propounded by the Upanishads.
Brahmasutra is also known as Vedanta Sutra and Sariraka Sutra.

Bhagavad Gita forms part of the Bhishma Parva of the
Mahabharata. It is in the form of a dialogue between Arjuna and Sri Krishna. Today,
Bhagavad Gita is like the Bible of Hindus. It also contains the teachings found
in the Vedas. The vast knowledge of Vedas is condensed in eighteen chapters.

Upanishads are part of the Vedas and they are the basis of
all philosophical teachings in Hinduism. The great Rishis who searched for
answers to disturbing questions like who am I, Where did I come from? , Where
will I Go? Is there a return?... etc poured out their thoughts in the
Upanishads.